Hi TD. Yes it is absolutely fixable. Will it look like NEW again? Maybe, that depends on the extent of the damage and how good a job the glasser does. I can tell you that, if you've gone through the gelcoat, this is no longer a cosmetic repair and should be taken care of before the boat is heavily used again. Believe it or not, fiberglass is not really all that water proof. If you are through the gelcoat and down to fiberglass, water can work it's way in and start causing problems. The longer you wait and the more water works its way in the more costly the eventual repair.
There are some forums out there (which will remain nameless) where the guys will say they;ve been beaching for years and it's no big deal. However the same forum members will recommend cinder block anchors, amongst a myriad of other bad advice. Beaching a boat is not good for a boat, particularly a fiberglass one. If you MUST, then I suggest installing a Keel Guard. I'd prefer to see the boat moored, anchored or trailored.
If you have some pics, that would help too.